drm/i915/selftests: Hold the vma manager lock while modifying mmap_offset

Right idea, wrong lock. We already drop struct_mutex before we free the
mmap_offset when freeing the object, so we need to take the vma manager
lock when manipulating the mmap_offset address space for our selftests.

Fixes: 8221d21b0664 ("drm/i915/selftests: Lock the drm_mm while modifying")
Signed-off-by: Chris Wilson <[email protected]>
Cc: Imre Deak <[email protected]>
Reviewed-by: Imre Deak <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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